CC Antya-lila 04.069 - SB 07.09.10
Sri Caitanya-caritamrta
CC Antya-lila
“"One may be born in a brāhmaṇa family and have all twelve brahminical qualities, but if in spite of being thus qualified he is not devoted to the lotus feet of Lord Kṛṣṇa, who has a navel shaped like a lotus, he is not as good as a caṇḍāla who has dedicated his mind, words, activities, wealth and life to the service of the Lord. Simply to take birth in a brāhmaṇa family or to have brahminical qualities is not sufficient. One must be a pure devotee of the Lord. Thus if a śva-paca, or caṇḍāla, is a devotee, he delivers not only himself but his entire family as well, whereas a brāhmaṇa who is not a devotee but simply has brahminical qualifications cannot even purify himself, what to speak of his family."
This is a verse from Śrīmad-Bhāgavatam (7.9.10).